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(No Modem `v P. O. MA-TTHIESSEN.

BQNE BLACK FILTER POR FILTERING SUGAR LIQUOR. No. 329,185.vPatented'0G13.' 27, 1885.

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EONE-BLACK FBLTER FOR FILTERING SUGAR=LQUORS SPECEFICATION forming partof Letters Patent No.329,185, dated October 27,1885.

Serial No. 165,829. (No model.)

To rv/ZZ who-nt t may conceive:

Be it known that I, FRANZ 0. MATTHIES- SEN, of Irvington, New York, haveinvented certain Improvements in Bone-Black Filters for FilteringSugar-Liquors, of which the following is a specification. Y

In bone-black iilters for filtering sugar-liquor by the process ofupward iiltration the lowest stratum Vof bone-black is that whichsoonest becomes exhausted, and it is the ob ject of my improvement toprovide for the gradual and uniform Yremoval of the lowest stratum ofbone-black without causing any violent falling movement of thesuperincumbent mass of boue-black, so that concurrently with the removalof the exhausted bone-black fresh bone-black can be introduced into thetop of the filter, where the filtered sugar-liquor is discharged; and myinvention consists in supporting a mass of boneblack in afilter-chamberupon the uppermost convolution of a screw rotating upon a verticalaxis,or upon the upper surface of a suitably perforated or slottedrotating disk provided with a shearing blade or blades. By the rotationof the said screw or the said disk the exhausted bone-black is graduallyremoved or cut off from the lower end of the mass of superincumbentbone-black, and is allowed to fall into a receiving-chamber, from whichit is removed by any convenient means-as, for example, ascrew conveyeror conveyers'.

The accompanying drawings represent my improvement in the form in whichI prefer to employ it applied to a bone-black filter provided with anelevator-screw incased in a suitable tube for removing` the exhaustedboneblack from the bottom of the filter or receiving-chamber.

Figure l is acentral vertical section through the filter andelevatortubes. Fig. 2 is ahori- Zout-al section through the line x .fron Fig. 1, showing the top of the discharger. Fig. 3 is a vert-icalsection of the discharger, taken through the line y y on Fig. 2.

In the iilter shown in the drawings the princpal body of bone-black, A,is contained in a large vertical cylinder, B, and rests at the bottomupon the discharger E, beneath which is the receiving-chamber a, intowhich the exhausted bone-black is caused to fall by the ac byhydrostatic pressure through the mass of y bone-black contained in thefiltering-chamber B and is discharged through suitably-screened openingsfrom the upper part of the chan1- ber B.

The discharger in the form which I prefer consists of a horizontal disk,E, affixed to the central vertical shaft, E', which is provided with asuitable bearing at the top of the lter, and projects therefrom, and isprovided with a pulley or toothed wheel, E2, by means of which power isimparted to rotate it. The lower end of the vertical shaft E is providedwith a bearing upon the upper surface of the horizontal beam F, whichextends across the receiving-chamber, and is secured. to the side wallthereof, and which has its central portion supported by the inclinedbraces F F.

In the case of a filter, and consequently of a discharger of largediameter, it will be desirable to support the rim as well as the centerof the discharger. This may be effected by means of conical rollers g gg g, &c., which have their axes radially arranged, andare provided withbearings in a circular frame, G, securely fastened to the interior wall.of the filter-cylinder B. The under surface of the rim of the dischargeris slightly chamfered, as shown, and bears upon the tops of theseconical rollers.

The discharger E is provided with a series of openings, e, extendingfrom its central portion outward nearly to its perimeter. These openingsare so far inclined as to prevent the bone-black from runningthroughthem merely by its own gravity, and their upper edges constitute theshearing-blades e, which, when the discharger is rotated in thedirection of the arrow shown in Fig. 2, shear or scrape the bone-blackfrom the lower surface of the mass IOO of bone-black contained in thefilter-chamber B, and thus cause it to be forced through the inclinedopenings e, from which it falls into the bottom of the receiving-chambera.

5 When the elevating-screw is employed for removing the spent bone-blackfrom the receivingchamber a, the latter is preferably made in the formof an inverted cone, the lower end of which is united to the lower part1o of the inclined tube or cylinder C', in which the elevator-screw C iscontained.

In operation, after the apparatus has been lled with sugar-liquor, therate at which the sugar-liquor is introduced through the supplypipe D,and consequently the rate at which it is discharged from the upper partof the chamber B,is graduated with reference to maintaining thesugar-liquor in contact with the boneblack for the length of timerequired to per- 2o fectly decolorize it. On the other hand, the

speed of rotation of the discharger is regulated with reference toeffecting the uniform andgradual removal of the exhausted boneblack fromthe lower part of the mass of boneblack contained in the chamber B asrapidly as the bone-black at that point becomes exhausted, and freshbone-black is fed into the upper end of the chamber' B at a ratecorresponding with that at which the exhausted bone-black'is removed. Bythis means theoperation of filtration is performed continuously, and allthe sugar-liquor passed through the lter is subjected to likeconditions, both as to duration of contact with bone-black and as toycontact with bone-black which is not eX- hausted. At the same time thereis no violent disturbance ot' the mass of bone-black sufficient tomaterially disturb the current of sugar-liquor and interfere with theefficient decolorizing action of the bone-black.

I claim as my inventionl. In a bone-black filter for ltering sugarliquorby the process of upward ltration, a ltering-chamber having at thebottom a discharger in the form of a screw or slotted disk provided witha shearing blade or blades, and means for rotating said discharger forthe purpose of gradually removing the exhausted bone-black from thebottom of the mass of bone-black contained in the ltering cham- 5o ber,in combination with a receiving-chamber for receiving said exhaustedbone-black, and means for removing the said exhausted bone-black fromthe receivingchamber, substantially as set forth.

2. A ltering-chamber for containing boneblack, having arranged beneathit a receivingchamber, and provided with means for the gradual loweringof the bone-black from the filtering-chamber into the receiving-chamber,6o in combination with an inclined elevatorscrew contained in acorrespondingly-inclined tube for removing theexhausted bone-black fromthe receiving-chamber, substantially as set forth.

F. O. MATTHIESSEN.

Witnesses:

RoBT. MOELLER, D. M. VAN VoRsT.

